package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;


@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    // 创建切点表达式，表明执行什么操作的时候会被切入

    // 切入点 切入点名称 autoFillPointCut
    // 切点表达式表明com.sky.mapper包下的所有类的所有被AutoFill注解标注方法
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("开始进行公共字段填充....");

        // 获取被拦截方法的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = annotation.value();

        // 获取到拦截到的方法的参数

        Object[] args = joinPoint.getArgs();

        if (args==null||args.length==0){
            return;
        }
        Object entity = args[0];

        // 准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();


        // 根据操作类型赋值
        if (operationType==OperationType.INSERT){
            try {
                Method SET_CREATE_TIME =  entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
                Method SET_UPDATE_TIME =  entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method SET_CREATE_USER =  entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
                Method SET_UPDATE_USER =  entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);
                // 赋值
                SET_CREATE_TIME.invoke(entity,now);
                SET_UPDATE_TIME.invoke(entity,now);
                SET_CREATE_USER.invoke(entity,currentId);
                SET_UPDATE_USER.invoke(entity,currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        } else if (operationType==OperationType.UPDATE) {

            try {
                Method SET_UPDATE_TIME =  entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method SET_UPDATE_USER =  entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);
                SET_UPDATE_TIME.invoke(entity,now);
                SET_UPDATE_USER.invoke(entity,currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }

        }


    }



}
